Issue #275 - Add apiKey as parameter

* The import process makes API calls to the source instance. This
  requests requires to be authenticated
* We have enabled REST security on _classic_ api
* The process doesn't have a way to know the API key of the source (it
  could be any other instance)
* The user is required to pass the apiKey as GET parameter
Issue #275 - Append apiKey param to the Task builder